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Current Question (ID: 14693)

Question:

Sebaceous gland secretion mainly contains

Options:

1. Amino acids and glucose
2. Sterols and lactic acid
3. NaCl and wax
4. Sterols and hydrocarbons

Solution:

Sebaceous glands are small glands in the skin that secrete an oily, waxy substance called sebum. Sebum is composed of lipids, such as triglycerides, free fatty acids, wax esters, and squalene. These lipids are synthesized by the sebaceous glands and then released into hair follicles or onto the surface of the skin. The lipids in sebum include sterols (such as cholesterol) and hydrocarbons (such as squalene and other long-chain alkanes). These lipids help to lubricate and waterproof the skin and hair, and they also have antimicrobial properties. Option 1 (amino acids and glucose) is incorrect because sebum does not contain significant amounts of amino acids or glucose. Option 2 (sterols and lactic acid) is incorrect because sebum does not contain lactic acid, although it does contain sterols. Option 3 (NaCl and wax) is incorrect because sebum does not contain significant amounts of NaCl (sodium chloride) or other salts, although it does contain wax esters.

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Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}